Yvonne's grandfather John Moss (1900-1965).
Son of James Moss b. 6 Sept 1863 Tingewick and Sarah Jane Swindells b. abt. 1867 and brother of Alice in the previous photo.
Her mother says he would have been abt 16 or 17 years when this was taken. Researching the badge it appears he was with The King's (Liverpool Regiment) 7th Battalion.